https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95724
Bug ID: 95724
Summary: bogue error : "expected '{' before ')' token"
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: haoxintu at gmail dot com
Target Milestone: ---
This code test.cc, GCC-trunk get a bogus error message and then get confused
with following code parsing.
$cat test.cc
template <(union : decltype(a = 0)>)
$g++-trunk -w -c test.cc
test.cc:1:11: error: expected identifier before ‘(’ token
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:29: error: ‘a’ was not declared in this scope
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:29: error: ‘a’ was not declared in this scope
test.cc:1:34: error: expected ‘{’ before ‘)’ token
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:36: error: expected unqualified-id before ‘)’ token
1 | template <(union : decltype(a = 0)>)
| ^
$g++-10 -w -c test.cc
test.cc:1:11: error: expected identifier before ‘(’ token
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:29: error: ‘a’ was not declared in this scope
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:29: error: ‘a’ was not declared in this scope
test.cc:1:35: error: expected ‘{’ before ‘>’ token
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:35: error: expected ‘,’ or ‘...’ before ‘>’ token
test.cc:1:36: error: expected ‘>’ at end of input
1 | template <(union : decltype(a = 0)>)
| ^
test.cc:1:36: error: expected unqualified-id at end of input
I guess GCC-trunk emits the bogus error message "expected ‘{’ before ‘)’
token", and the following error messages are inconsistent with GCC-10. So,
GCC-trunk might have something wrong with while parsing this code.
